Optical head device
12 3 12313231323An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained.A broadband phase plate comprising two phase plates A and B laminated with e.g. an adhes...
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| Sprache: | eng |
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| Zusammenfassung: | 12 3 12313231323An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained.A broadband phase plate comprising two phase plates A and B laminated with e.g. an adhesive agent so that their optical axes are crossed, wherein provided that wavelengths of linearly polarized incident light beams are λ, λand λ(λ |
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